/* Canonical web and EPUB foundation for books in the NeutrinoHit universe. */

:root {
  --book-ink: #18262f;
  --book-ink-soft: #42545f;
  --book-muted: #687984;
  --book-paper: #ffffff;
  --book-canvas: #f4f6f7;
  --book-line: #d9e0e3;
  --book-line-strong: #bcc9ce;
  --book-teal: #0f6972;
  --book-teal-dark: #094b52;
  --book-teal-soft: #e8f1f2;
  --book-blue: #2f6f9f;
  --book-blue-soft: #edf3fa;
  --book-coral: #c7472f;
  --book-coral-soft: #faeeeb;
  --book-gold: #b97817;
  --book-gold-soft: #fbf3e4;
  --book-shadow: 0 18px 42px -34px rgba(24, 38, 47, 0.5);
  --book-serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --book-sans: "Avenir Next", Avenir, "Segoe UI", system-ui, sans-serif;
}

html {
  scroll-behavior: smooth;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  color: var(--book-ink);
  background: var(--book-canvas);
  font-family: var(--book-serif);
  font-size: 1.08rem;
  line-height: 1.72;
}

a {
  color: var(--book-teal);
  text-decoration-color: rgba(15, 105, 114, 0.32);
  text-underline-offset: 0.16em;
}

a:hover,
a:focus {
  color: var(--book-teal-dark);
  text-decoration-color: currentColor;
}

h1,
h2,
h3,
h4,
h5,
h6,
.sidebar,
.toc-actions,
.page-navigation,
.chapter-number {
  font-family: var(--book-sans);
}

h1,
h2,
h3 {
  color: var(--book-ink);
  letter-spacing: 0;
}

h1 {
  max-width: none;
  font-size: clamp(2.3rem, 5vw, 4rem);
  line-height: 1.02;
}

h2 {
  margin-top: 2.8rem;
  padding-top: 0.35rem;
  border-top: 1px solid var(--book-line);
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  line-height: 1.14;
}

h3 {
  margin-top: 2rem;
  font-size: 1.35rem;
  line-height: 1.25;
}

p,
li {
  max-width: none;
}

main.content {
  width: 100%;
  max-width: none;
  min-width: 0;
  overflow-x: clip;
  padding-top: 2.2rem;
  padding-bottom: 5rem;
}

.page-columns > *,
main.content > *,
main.content section,
main.content div,
main.content figure {
  min-width: 0;
}

main.content img,
main.content video,
main.content iframe,
main.content canvas,
main.content svg {
  max-width: 100%;
}

main.content pre,
main.content code,
main.content .sourceCode {
  max-width: 100%;
}

main.content pre,
main.content .sourceCode,
.math.display,
.MathJax_Display {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}

/* MathJax 3 uses custom elements rather than the MathJax 2 class names. */
main.content mjx-container {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}

.page-columns .content {
  background: var(--book-paper);
  box-shadow: var(--book-shadow);
}

#quarto-content.page-columns {
  column-gap: 0;
}

#title-block-header {
  margin-bottom: 2.5rem;
}

.quarto-title .title {
  margin-bottom: 0.6rem;
}

.quarto-title .subtitle {
  max-width: 36ch;
  color: var(--book-muted);
  font-family: var(--book-serif);
  font-size: 1.35rem;
  line-height: 1.35;
}

.chapter-number {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--book-teal);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.sidebar {
  background: #eef2f3;
  border-right: 1px solid var(--book-line);
}

.sidebar-title {
  color: var(--book-ink);
  font-weight: 750;
  line-height: 1.15;
}

.sidebar-item .sidebar-item-text {
  color: var(--book-ink-soft);
}

.sidebar-item .sidebar-link.active {
  color: var(--book-teal-dark);
  font-weight: 700;
}

.sidebar-item-section > .sidebar-item-container > .sidebar-item-text {
  color: var(--book-ink);
  font-weight: 750;
}

.sidebar nav[role="doc-toc"] ul > li > a.active,
.sidebar nav[role="doc-toc"] ul > li > ul > li > a.active {
  color: var(--book-teal);
  border-left-color: var(--book-teal);
}

/* Keep a local-file preview usable even before Bootstrap JavaScript runs. */
#quarto-margin-sidebar #TOC > ul.collapse {
  display: block;
}

.quarto-secondary-nav-title {
  font-family: var(--book-sans);
}

.page-navigation {
  margin-top: 4rem;
  border-top: 1px solid var(--book-line);
}

.nav-page .nav-page-text {
  color: var(--book-teal-dark);
  font-weight: 650;
}

blockquote {
  margin: 1.6rem 0;
  padding: 0.3rem 0 0.3rem 1.25rem;
  border-left: 3px solid var(--book-teal);
  color: var(--book-ink-soft);
  font-size: 1.05rem;
}

.book-lead {
  clear: both;
  margin: 2rem 0 3rem;
  padding: 1.35rem 1.55rem;
  border-top: 4px solid var(--book-teal);
  background: var(--book-teal-soft);
  color: var(--book-ink);
  font-size: 1.18rem;
  line-height: 1.62;
}

table {
  width: 100%;
  max-width: 100%;
  margin: 1.6rem 0 2rem;
  border-color: var(--book-line);
  font-family: var(--book-sans);
  font-size: 0.94rem;
  line-height: 1.45;
  table-layout: fixed;
}

thead {
  border-bottom: 2px solid var(--book-teal);
}

tbody tr:nth-child(even) {
  background: #f7f9fa;
}

th,
td {
  padding: 0.72rem 0.8rem;
  vertical-align: top;
  overflow-wrap: anywhere;
}

figcaption {
  color: var(--book-muted);
  font-family: var(--book-sans);
  font-size: 0.82rem;
  line-height: 1.4;
}

@media (max-width: 991px) {
  body {
    font-size: 1rem;
  }

  .page-navigation .nav-page {
    flex: 1 1 0;
    min-width: 0;
  }

  .page-navigation .pagination-link {
    max-width: 100%;
    width: 100%;
  }

  .page-navigation .nav-page-text {
    min-width: 0;
    overflow-wrap: anywhere;
  }

  main.content {
    padding-top: 1.4rem;
    padding-bottom: 3rem;
  }

  h1 {
    font-size: clamp(2rem, 10vw, 3rem);
  }

  table {
    display: block;
    overflow-x: auto;
    table-layout: auto;
  }
}

@media print {
  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
  }

  .page-columns .content {
    box-shadow: none;
  }

  a {
    color: inherit;
    text-decoration: none;
  }
}

/* Shared book components. Subject books may change colour tokens, but their
   structure and placement stay identical across the NeutrinoHit universe. */

aside.biography,
div.biography {
  grid-column: body-content-start / body-content-end !important;
  clear: both !important;
  position: static !important;
  float: none !important;
  display: flex;
  align-items: stretch;
  gap: 1.25rem;
  width: 100% !important;
  max-width: none !important;
  margin: 2rem 0 !important;
  padding: 1.15rem 1.25rem;
  border-left: 5px solid var(--book-blue);
  background: var(--book-blue-soft);
  box-shadow: 0 14px 30px -28px rgba(30, 44, 70, 0.7);
}

.biography-photo {
  flex: 0 0 min(29%, 12rem);
  align-self: stretch;
}

.biography-photo a {
  display: block;
  height: 100%;
}

.biography-portrait {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 11rem;
  max-height: 17rem;
  border: 1px solid rgba(70, 91, 140, 0.2);
  object-fit: cover;
  object-position: center top;
}

.biography-copy {
  flex: 1 1 auto;
  align-self: center;
  min-width: 0;
}

.biography-label,
.biography-name,
.biography-years,
.biography-sources {
  font-family: var(--book-sans);
}

.biography-label {
  margin-bottom: 0.15rem;
  color: var(--book-blue);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.biography-name {
  color: var(--book-ink);
  font-size: 1.35rem;
  font-weight: 750;
  line-height: 1.16;
}

.biography-years {
  margin-top: 0.18rem;
  color: var(--book-muted);
  font-size: 0.9rem;
}

.biography-copy > p {
  margin: 0.75rem 0 0;
  line-height: 1.55;
}

.biography-sources {
  margin-top: 0.8rem;
  color: var(--book-muted);
  font-size: 0.76rem;
  line-height: 1.4;
}

.biography-sources p {
  margin: 0;
}

h2.exercise-heading,
h3.exercise-heading {
  margin: 0 0 0.7rem;
  padding: 0;
  border: 0;
  font-size: 1.08rem;
  line-height: 1.28;
}

.exercise-heading .header-section-number {
  display: none;
}

section.level2:has(> h2.exercise-heading),
section.level3:has(> h3.exercise-heading) {
  clear: both;
  margin: 1rem 0;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--book-coral);
  background: var(--book-coral-soft);
}

.animation-block {
  clear: both;
  display: block;
  margin: 2.2rem 0;
  padding: 1rem;
  border: 1px solid #23333d;
  background: #101820;
  color: #fff;
  box-shadow: 0 18px 34px -28px rgba(0, 0, 0, 0.85);
}

.animation-block video,
.animation-block img {
  display: block;
  width: min(100%, 900px);
  max-height: 68vh;
  margin: 0 auto;
  object-fit: contain;
}

.animation-block iframe.animation-embed {
  display: block;
  width: 100%;
  height: 34rem;
  margin: 0 auto;
  border: 0;
  border-radius: 0.45rem;
  background: #000;
}

.animation-block figcaption {
  margin-top: 0.75rem;
  color: #fff;
  text-align: center;
}

.animation-block a {
  color: #b9e5ed;
}

.animation-block img.animation-qr,
.animation-qr {
  width: 132px;
  max-width: 36%;
  margin: 1rem auto 0;
  padding: 0.3rem;
  background: #fff;
}

.process-flow {
  display: grid;
  grid-template-columns: repeat(var(--process-columns, 1), minmax(0, 1fr));
  gap: 1.5rem;
  clear: both;
  margin: 2rem 0;
}

.process-step {
  position: relative;
  min-width: 0;
  padding: 1rem 1.05rem 1.1rem;
  border: 1px solid var(--book-line-strong);
  border-top: 4px solid var(--book-teal);
  background: var(--book-paper);
  box-shadow: 0 14px 28px -28px rgba(24, 38, 47, 0.75);
}

.process-step:not(:last-child)::after {
  content: "→";
  position: absolute;
  z-index: 1;
  top: 50%;
  left: calc(100% + 0.08rem);
  width: 1.35rem;
  color: var(--book-teal);
  font-family: var(--book-sans);
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1;
  text-align: center;
  transform: translateY(-50%);
}

.process-flow-vertical {
  grid-template-columns: 1fr;
  gap: 1.7rem;
}

.process-flow-vertical .process-step:not(:last-child)::after {
  content: "↓";
  top: calc(100% + 0.25rem);
  left: 50%;
  width: 1.4rem;
  transform: translateX(-50%);
}

.process-step-label,
.process-step-title {
  font-family: var(--book-sans);
}

.process-step-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.15rem;
  min-height: 2.15rem;
  margin-bottom: 0.9rem;
  padding: 0.25rem;
  border-radius: 50%;
  background: var(--book-teal);
  color: #fff;
  font-size: 0.76rem;
  font-weight: 800;
  line-height: 1;
}

.process-step-title {
  color: var(--book-ink);
  font-size: 1rem;
  line-height: 1.25;
}

.process-step-body {
  margin-top: 0.45rem;
  color: var(--book-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.process-step-body > :first-child { margin-top: 0; }
.process-step-body > :last-child { margin-bottom: 0; }

@media (max-width: 900px) {
  .process-flow {
    grid-template-columns: 1fr;
    gap: 1.7rem;
  }

  .process-step:not(:last-child)::after {
    content: "↓";
    top: calc(100% + 0.25rem);
    left: 50%;
    width: 1.4rem;
    transform: translateX(-50%);
  }
}

@media (max-width: 700px) {
  aside.biography,
  div.biography {
    display: block;
  }

  .biography-photo {
    width: min(68%, 14rem);
    margin: 0 auto 1rem;
  }

  .animation-block iframe.animation-embed {
    height: 22rem;
  }
}